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These commands read and write entire files, possibly transforming them in some way.
3.1 cat
: Concatenate and write filesConcatenate and write files. 3.2 tac
: Concatenate and write files in reverseConcatenate and write files in reverse. 3.3 nl
: Number lines and write filesNumber lines and write files. 3.4 od
: Write files in octal or other formatsWrite files in octal or other formats.